MC
Mary Costa — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Atlantic-County, New Jersey
Our Model Tree links this Mary Costa across the 1930 and 1940 US Censuses in Atlantic-County, New Jersey (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 10-person household.
Age 17
b. ~1923
Female
Daughter
Born: New Jersey
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Atlantic-County, New Jersey |
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Town of Hammonton |
| 1935 Residence (County) | Atlantic |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Town Of Hammonton |
| Est. Birth Year | ~1923 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rose Costa | Daughter | — | 14 | ~1926 |
| Martha Garofolo | Daughter | — | 23 | ~1917 |
| Albert Garofolo | Other | — | 24 | ~1916 |
| Lillian Costa | Daughter | — | 21 | ~1919 |
| Josephine Costa | Daughter | — | 19 | ~1921 |
| Florence Costa | Spouse | — | 47 | ~1893 |
| Mary Costa | Daughter | — | 17 | ~1923 |
| Theresa Costa | Daughter | — | 8 | ~1932 |
| Frankie Garofolo | Other | — | 2 | ~1938 |
| Angelo Costa | Head | — | 50 | ~1890 |
Census Appearances
1930
Atlantic, New …
Daughter, age 7
Atlantic, New Jersey · implied b. ~1923 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Italy |
| Mother's Birthplace | Italy |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Atlantic-County, New …
Daughter, age 17
Atlantic-County, New Jersey · implied b. ~1923 — 10 household members
| Surname | Costa |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Town of Hammonton |
| 1935 Residence (County) | Atlantic |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Costa across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Costa
Daughter · 1940 · age 17 · b. ~1923 · New Jersey
★ You are viewing this record
Sibling
Martha Garofolo
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Costa
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Costa
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Costa
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Costa
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Atlantic-County, New Jersey
Open full size
1940 US Federal Census — Atlantic-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02302-00594)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rose Rose | 6 | daughter | — | New Jersey |
| 2 | Frank Rose | 4 | son | — | New Jersey |
| 3 | — | None | — | — | — |
| 4 | Dominic Passalacqua | 29 | head | Presser | Italy |
| 5 | Rose Passalacqua | 30 | wife | Operator | Penn |
| 6 | Bettie Jane Passalacqua | 3 | daughter | — | New Jersey |
| 7 | Carmello Bartholomew | 39 | head | Labor | Italy |
| 8 | Madeline Bartholomew | 30 | wife | Housewife | Italy |
| 9 | Marie Bartholomew | 3 | daughter | — | New Jersey |
| 10 | Frank Bartholomew | 7 | son | — | New Jersey |
| 11 | — | None | — | — | — |
| 12 | — | None | — | — | — |
| 13 | Mariano Arena | 51 | head | Bartender | Italy |
| 14 | Ida Arena | 47 | wife | Finisher | Italy |
| 15 | Rose Arena | 20 | daughter | — | Penn |
| 16 | John Arena | 19 | son | Barber | Penn |
| 17 | Angelina Arena | 16 | daughter | — | Penn |
| 18 | Susie Arena | 15 | daughter | — | Penn |
| 19 | James Arena | 13 | son | — | New Jersey |
| 20 | Lena Olivo | 52 | head | Merchant | Italy |
| 21 | Mary Olivo | 32 | daughter | Music Teacher | New Jersey |
| 22 | Matthew Olivo | 29 | son | — | New Jersey |
| 23 | Marie Olivo | 82 | mother | — | Italy |
| 24 | Angelo Costa | 50 | head | Baker | Italy |
| 25 | Florence Costa | 47 | wife | Housewife | Italy |
| 26 | Lillian Costa | 21 | daughter | Helper | New Jersey |
| 27 | Josephine Costa | 19 | daughter | — | New Jersey |
| 28 | Mary Costa THIS PERSON | 17 | daughter | — | New Jersey |
| 29 | Rose Costa | 14 | daughter | — | New Jersey |
| 30 | Theresa Costa | 8 | daughter | — | New Jersey |
| 31 | Martha Garofolo | 23 | daughter | Operator | New Jersey |
| 32 | Albert Garofolo | 24 | son-in-law | Salesman | New Jersey |
| 33 | Frankie Garofolo | 2 | grand-son | — | New Jersey |
| 34 | Nunzio Costa | 28 | head | Presser | New Jersey |
| 35 | Carmella Costa | 25 | wife | — | New Jersey |
| 36 | Infant Costa | 0 | daughter | — | New Jersey |
| 37 | Sam Perone | 46 | head | Labor | Italy |
| 38 | Francis Perone | 46 | wife | — | New Jersey |
| 39 | Nickie Perone | 20 | son | — | New Jersey |
| 40 | Anthony Perone | 19 | son | — | New Jersey |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)